Protein engineering with artificial chemical nucleases

2015 ◽  
Vol 51 (65) ◽  
pp. 12908-12911 ◽  
Author(s):  
Ruth Larragy ◽  
Jenny Fitzgerald ◽  
Andreea Prisecaru ◽  
Vickie McKee ◽  
Paul Leonard ◽  
...  
Keyword(s):  
Protein Engineering ◽  
Chemical Nucleases ◽  
Phenanthroline Complex

The process of protein engineering using artificial chemical nucleases is reported using the Cu(ii)-bis-1,10-phenanthroline complex.

Insights into the biochemical and functional characterization of sortase E transpeptidase of Corynebacterium glutamicum

2019 ◽  
Vol 476 (24) ◽  
pp. 3835-3847 ◽  
Author(s):  
Aliyath Susmitha ◽  
Kesavan Madhavan Nampoothiri ◽  
Harsha Bajaj
Keyword(s):  
Protein Engineering ◽  
Cell Attachment ◽  
Functional Characterization ◽  
Protein Structures ◽  
Structural Similarity ◽  
Surface Proteins ◽  
Sortase A ◽  
Peptide Cleavage ◽  
New Findings

Most Gram-positive bacteria contain a membrane-bound transpeptidase known as sortase which covalently incorporates the surface proteins on to the cell wall. The sortase-displayed protein structures are involved in cell attachment, nutrient uptake and aerial hyphae formation. Among the six classes of sortase (A–F), sortase A of S. aureus is the well-characterized housekeeping enzyme considered as an ideal drug target and a valuable biochemical reagent for protein engineering. Similar to SrtA, class E sortase in GC rich bacteria plays a housekeeping role which is not studied extensively. However, C. glutamicum ATCC 13032, an industrially important organism known for amino acid production, carries a single putative sortase (NCgl2838) gene but neither in vitro peptide cleavage activity nor biochemical characterizations have been investigated. Here, we identified that the gene is having a sortase activity and analyzed its structural similarity with Cd-SrtF. The purified enzyme showed a greater affinity toward LAXTG substrate with a calculated KM of 12 ± 1 µM, one of the highest affinities reported for this class of enzyme. Moreover, site-directed mutation studies were carried to ascertain the structure functional relationship of Cg-SrtE and all these are new findings which will enable us to perceive exciting protein engineering applications with this class of enzyme from a non-pathogenic microbe.

Protein Engineering of Penicillin Acylase

Acta Naturae ◽  
2010 ◽  
Vol 2 (3) ◽  
pp. 47-61 ◽  
Author(s):  
V I Tishkov ◽  
S S Savin ◽  
A S Yasnaya
Keyword(s):  
Protein Engineering ◽  
Penicillin Acylase

scholarly journals Flavin Adenine Dinucleotide-Dependent Halogenase XanH and Engineering of Multifunctional Fusion Halogenases

2020 ◽  
Vol 86 (18) ◽  
Author(s):  
Lingxin Kong ◽  
Qing Wang ◽  
Zixin Deng ◽  
Delin You
Keyword(s):  
Protein Engineering ◽  
Fusion Protein ◽  
Natural Product ◽  
Flavin Adenine Dinucleotide ◽  
High Efficiency ◽  
Genetic Manipulation ◽  
Good Alternative ◽  
Limited Information ◽  
Flavin Reductase ◽  
Free Standing

ABSTRACT Xantholipin (compound 1), a polycyclic xanthone antibiotic, exhibited strong antibacterial activities and showed potent cytotoxicity. The biosynthetic gene cluster of compound 1 has been identified in our previous work, and the construction of xanthone nucleus has been well demonstrated. However, limited information of the halogenation involved in compound 1 biosynthesis is available. In this study, based on the genetic manipulation and biochemical assay, we characterized XanH as an indispensable flavin adenine dinucleotide (FAD)-dependent halogenase (FDH) for the biosynthesis of compound 1. XanH was found to be a bifunctional protein capable of flavin reduction and chlorination and exclusively used the NADH. However, the reduced flavin could not be fully and effectively utilized, and the presence of an extra flavin reductase (FDR) and chemical-reducing agent could promote the halogenation. XanH accepted its natural free-standing substrate with angular fused polycyclic aromatic systems. Meanwhile, it exhibited moderate halogenation activity and possessed high substrate specificity. The requirement of extra FDR for higher halogenation activity is tedious for future engineering. To facilitate efforts in engineering XanH derivative proteins, we constructed the self-sufficient FDR-XanH fusion proteins. The fusion protein E1 with comparable activities to that of XanH could be used as a good alternative for future protein engineering. Taken together, these findings reported here not only improve the understanding of polycyclic xanthones biosynthesis but also expand the substrate scope of FDH and pave the way for future engineering of biocatalysts for new active substance synthesis. IMPORTANCE Halogenation is important in medicinal chemistry and plays an essential role in the biosynthesis of active secondary metabolites. Halogenases have evolved to catalyze reactions with high efficiency and selectivity, and engineering efforts have been made to engage the selective reactivity in natural product biosynthesis. The enzymatic halogenations are an environmentally friendly approach with high regio- and stereoselectivity, which make it a potential complement to organic synthesis. FDHs constitute one of the most extensively elucidated class of halogenases; however, the inventory awaits to be expanded for biotechnology applications and for the generation of halogenated natural product analogues. In this study, XanH was found to reduce flavin and halogenated the freely diffusing natural substrate with an angular fused hexacyclic scaffold, findings which were different from those for the exclusively studied FDHs. Moreover, the FDR-XanH fusion protein E1 with comparable reactivity to that of XanH serves as a successful example of genetic fusions and sets an important stage for future protein engineering.

Rational Protein Engineering Of α-L-Arabinofuranosidase From Aspergillus niger For Improved Catalytic Hydrolysis Efficiency on Kenaf Hemicellulose

2020 ◽  
Author(s):  
Nardiah Rizwana Jaafar ◽  
Siti Norbaidurah Ayob ◽  
Noor Hidayah Abdul Rahman ◽  
Farah Diba Abu Bakar ◽  
Abdul Munir Abdul Murad ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Protein Engineering ◽  
Catalytic Hydrolysis

PyPEF—An Integrated Framework for Data-Driven Protein Engineering

2021 ◽  
Author(s):  
Niklas E. Siedhoff ◽  
Alexander-Maurice Illig ◽  
Ulrich Schwaneberg ◽  
Mehdi D. Davari
Keyword(s):  
Protein Engineering ◽  
Data Driven ◽  
Integrated Framework
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